为const char指针赋值 [英] const char pointer assignments

问题描述

是以下分配有效吗？或将任何这些产生问题。请建议。

 为const char * C1;
为const char * C2;
为const char * C3;
字符* C4;C2 = C1;
C2 = C3;
C2 = C4;
 

如果我这样做，是正常事是什么？

 为const char * C5 =XYZ;
char *之C6 =ABC;C2 = C5;
C2 = C6;
 

解决方案

在你的心中画通过asterik一条线。左边是被指向和向右什么类型的指针

什么

例如

1. 为const char * const的P - 指针 P 是恒定的，因此是<$ C $字符C> p 点 - 即不能改变指针和内容都什么 p 点


2. 为const char * P - P 指向常量字符。您可以更改 P 的价值，让它指向不同的常量字符。但无论 P 点，你不能改变的内容。


3. char * const的P - 你是无法改变的指针，但可以改变的内容

最后

1. 的char * P - 一切都待价而沽

希望有所帮助。

Are the following assignments valid? Or will any of these create problems. Please suggest.

const char * c1;  
const char * c2; 
const char * c3;
char * c4;

c2 = c1;
c2 = c3;
c2 = c4;

What if I do the following, is that ok thing to do?

const char * c5 = "xyz";
char * c6 = "abc";

c2 = c5;
c2 = c6;

解决方案

In your mind draw a line through the asterik. To the left is what is being pointed to and to the right what type of pointer

For example

1. const char * const p - The pointer p is constant and so are the characters that p points to - i.e. cannot change both the pointer and the contents to what p points to
2. const char * p - p points to constant characters. You can change the value of p and get it to point to different constant characters. But whatever p points to, you cannot change the contents.
3. char * const p - You are unable to change the pointer but can change the contents

and finally

1. char * p - Everything is up for grabs

Hope that helps.

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